Quote from Lois in Flashback
[flashback:] Lois: Ow! Hal: Another contraction? Lois: No! He's kicking me in between contractions. What the hell is with this kid? Doctor: [enters] Well, are we having fun yet? [off Lois and Hal's looks] Okay, let's take a look in the oven. Lois: Ow! God! How far along am I? 'Cause I swear to God, he's biting my kidney.